User blog comment:Bluetigermonkey11/my theories on where the legends will spawn/@comment-32358261-20180211111529

Contrary to what many people believe, ultra beasts have recently confirmed not legendary Pokémon at all. They were simply just strong Pokémon coming from different worlds.

Also type null and silvally are considered legendaries.

It’s weird. The Pokémon you think are legendary are not but the Pokémon that you think isn’t legendary really is.